© 2019 autodesk, inc. · early interest at autodesk § consistent looks across autodesk dccs §...

Eric Bourque Jonathan Stone Iliyan Georgiev Davide Pesare David Larsson Nikola MiloševićDirector of Engineering Principal Product DesignerPrincipal DeveloperSr Software Engineer

ADGHead of Labs Sr Software Engineer

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MaterialX: Origins at Lucasfilm

Open-Source Data Formats

§ Rich material description, node-based and color space-aware

MaterialX Initiative


§ First significant usage on Star Wars: The Force Awakens in 2015




§ Open standard published in 2016




§ Open standard published in 2016§ Open-source codebase released in

2017


Early Interest at Autodesk

§ Consistent looks across Autodesk DCCs§ multiple renderers in a

single DCC§ physics as ground truth

§ Abstract Material Graph (AMG)

§ abcMaterial, MaterialX

§ Worked together with Lucasfilm to help build an open industry standard

§ A partnership between Lucasfilm and Autodesk beginning in June of 2016

§ Inheriting the best of both MaterialXand Abstract Material Graphs

§ Autodesk begins developing two key extensions to MaterialX

ShaderX Collaboration

§ The first new feature is a standard set of physically-based shading nodes

§ In addition to patterns, the underlying physically-based shaders can now be portably captured

§ MaterialX ships with shading graphs for Standard Surface and USD Preview Surface

Physically-Based Shading Nodes

§ The second new feature is a framework for shader code generation

§ Automatic conversion of a MaterialX document to domain-specific shading code for rendering

§ MaterialX ships with support for OSL and GLSL, with additional languages planned

Shader Code Generation

§ Leverages MaterialX shader generation in combination with the open NanoGUI framework

§ Provides a ground truth reference for renders of MaterialX content

§ Provides a reference for integration of MaterialX shader code generation into other applications

MaterialX Viewer

§ Autodesk is a strong supporter of Open Source software

§ Our customers’ pipelines are heterogeneous

§ Founding member of the ASWF

§ providing funding and technical expertise

§ helping drive strategic direction

Open @ Autodesk

§ Actively contributing to many existing projects

§ OCIO v2

§ MaterialX

§ USD

§ Have open sourced our own projects:

§ AnimX

§ ShaderX

§ sitoa

§ Standard Surface

Open @ Autodesk

Standard Surface v1.0.1

An open spec by Autodesk

§ Open uber-shader specification§ Artist-friendly parameters § Production proven§ Supported in Autodesk products

What is Standard Surface?

§ Compactly represent most materials§ Modern set of scattering lobes

§ Easy to use§ Minimal set of intuitive parameters

§ Simplification for§ partial representations§ real-time applications

Goals

§ Available now autodesk.github.io/standard-surface

§ Open source (Apache License 2.0) github.com/autodesk/standard-surface

§ Reference implementation§ MaterialX§ OSL

Whitepaper

https://autodesk.github.io/standard-surface/

https://github.com/Autodesk/standard-surface

Inspiration

Layered Mixture Model

Closure representation

Transparency

Emission

Thin film

Specular reflection& transmission

Diffuse reflection& transmission

Subsurface scattering

§ Reciprocity§ Improved layering model

Future work

Join the conversation!

github.com/autodesk/standard-surface

Contribute!

https://github.com/Autodesk/standard-surface

Why we need a newstandard Uber Shader

§ Procedural packages, from a comp graph

§ Typically bake specific textures before render§ e.g. albedo, roughness, height, etc...

Compositinggraph

Substance Materials in a nutshell

Bake to textures

§ Rely on standard Uber-Shaders§ Know how to approximate for speed

Compositinggraph

Standard Shaders

Maximize Portability

StandardPreview

Bake to textures

§ Conversion to other shading models is known§ Easy to adopt and port (even when lossy)

Compositinggraph

Maximize Portability

§ "Playmobil": Uber Shadersoften good for 90% assets. More common and makes exchange easier

§ Lego: Lobe combiningmore powerful, covers final 10% of LookDev challenges

Two production strategies for Surfaces

§ Thanks to the ShaderX addition, MaterialX now supports the Lego approach

§ With packaging and subgraphs, it can support well Playmobil approaches too

Can work with either

§ Our baseline shading models don't cover cases that are now common§ Too many semi-documented

extended variants for advanced lobes

§ We were considering drafting our own updated standard

We like the portability of UberShaders

§ UberShaders need strong standards to be successful for exchange purposes

§ Need very good documentation§ One standard is better than none

Standards are hard

§ UberShaders need strong standards to be successful for exchange purposes

§ Need very good documentation§ One standard is better than none§ One standard is also better than too many

§ Must have very good reasons to create a new one§ Takes time to gather support from other vendors and studios

§ If only we could find someone to collaborate right from the start…

Standards are hard

§ Last Siggraph, Autodesk included us on a draft whitepaper for a Standard Surface

§ Perfect timing to start a collaboration

Let’s collaborate on a standard

§ Good balance:§ More complete feature set§ Not overcomplicated§ Considers simplifications for

preview purposes

§ Well documented, well thought through§ Crucial to adopt it partially, or evolve towards it

§ First serious effort to make a collaborative BXDF UberShader§ Included in the discussion top experts in the field

We like Standard Surface

§ We are interested in growing some of our existing materials towards it§ Would like to fully embrace it

natively § That is not the state currently

§ We still must be able to export to most models

We like Standard Surface

Implemented for Substance Designer

§ Please follow and participate to this project on GitHub!

Contribute

MaterialX Prototype in Substance Designer

David Larsson

Autodesk Vision Series

Making and sharing Materials

Art by Nikola Damjanov

Shaders

DemoMaterialX Editor in Substance Designer

Maya / Arnold Demo

Questions?

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© 2019 autodesk, inc. · early interest at autodesk § consistent looks across autodesk dccs §...

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